There's a good reason for that. According to Microsoft, a bra is close to the heart. You know…
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But as NicoNico reports, the True Love Tester is currently not for sale. But! If you purchase over 5,000 yen (about US$50) worth of Ravijour lingerie, you can enter to win a chance to test it out at hotels in six different cities (you pick the city!) across Japan. Five lucky couples will be selected.

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So, yes, this is part of a promotional campaign. It's also the first time a bra like this has been developed. For science!